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Stock-Based Compensation Plans (Details 3) (Employee Stock Option [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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May 31, 2012 | May 31, 2011 | May 31, 2010
Employee Stock Option [Member] |  |  |
Stock based compensation, stock option plan other information |  |  |
Total intrinsic value of stock options exercised | $ 0.8 | $ 1.9 | $ 1.4
Total grant date fair value of stock options vested | $ 10.4 | $ 20.0 | $ 19.0

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- Definition Share based compensation arrangement by share based payment award options vested in period fair value. + References No definition available. + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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